How to write python expressions

An expression is a combination of values, variables and operators (or operators). A single value is an expression, and a single variable is an expression.

A typical expression generally consists of operators and operands/operating objects. (Recommended learning: Python video tutorial)

Operator: A symbol for performing operations on operands/operating objects.

Operator/operating object: the data processed by the operator.

Commonly used operators in conditional expressions are as follows:

(1) Arithmetic operators: - * / // % ** ~

(2) Relational operators: > < == != <> <= >=

(3) Test operators: in, not in, is, not is

(4) Logical operators: and, or, not

1. Arithmetic expressions and values ​​

The operation result of arithmetic expression is numeric type, and non-zero values ​​can be converted into It is regarded as True, and the zero value is regarded as False, that is, it can also be regarded as the result of Boolean operation.

2. Relational expressions and values ​​

Use two equal signs to compare whether the two operands are equal, the result will be True or False

 >>>3==3
 True
 >>>3==4
 False

Test expression
Member Test
Member test uses the cloud characters in and not in to return a logical value in the expression.

>>>a=[1,2,3]
>>>1 in a
True
>>>5 in a
False

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